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Orion Telescopes
Orion BT100 Premium Binocular Telescope
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  • Binocular-telescope with large 100mm aperture objective lenses provides bright wide-field views rich in contrast, depth, and detail
  • Accepts most 1.25" interchangeable eyepieces so you can view at different magnifications (requires two eyepieces of the same focal length)
  • Includes two eyepieces that provide 22x magnification through the big binocular-telescope, which has a focal length of 609mm
  • Fully multi-coated optics, BAK-4 prisms, and retractable lens shades maximize light throughput and minimize peripheral glare for optimized viewing performance
  • Individual eyepiece focus and adjustable interpupillary distance lets you get the most out of each and every view

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Item #  09515

Sometimes two eyes are better than one!

The versatile Orion BT100 allows you to use both eyes simultaneously when you're stargazing. Besides making your views more comfortable, using both eyes will give each observation more depth, enhanced contrast, and better resolution compared to using a similarly sized telescope equipped with a single eyepiece.

The BT100 Premium Binocular Telescope features very large 100mm aperture objective lenses that gobble up light from the night sky, so each and every view is pleasantly bright and vivid. The fully multi-coated optics of the BT100, including top-quality BAK-4 prisms, work together to maximize the amount of light that reaches your eyes for sharp, high-contrast stargazing performance. 

We include a pair of 1.25" eyepieces with the BT100 that provide 22x magnification, but one of the many great features of this premium binocular telescope is its ability to accept other 1.25" telescope eyepiece pairs when you want to use it for higher or lower power observations. Two eyepieces of the same focal length are required, and most 1.25" telescope eyepieces are compatible. You can use the BT100's 609mm focal length to determine the magnification different eyepiece pairs will deliver. For example, two 10mm eyepieces will deliver a 60.9x view in the BT100 (609 / 10 = 60.9). The included 22x eyepieces yield a nice, 2.2 field-of-view and 16.9mm of eye relief.

The BT100's 90 eyepiece holder orientation makes nighttime observing comfortable, as there is no need to contort yourself in order to enjoy the view while the binocular telescope is attached to a tripod and pointing at the sky. Speaking of tripods, we recommend using an Orion heavy-duty field tripod or Orion altazimuth mount to support the 14.7 lb. BT100 (tripods available separately).

The BT100 Premium Binocular Telescope features individual eyepiece focus for precise focus control that even the most discerning observer will appreciate. The eyepiece holders' interpupillary distance can be adjusted from 57mm to 74mm to match the distance between your eyes for optimal viewing comfort.

Each big, 100mm barrel of the BT100 features a retractable objective lens shade to help keep peripheral light from streetlights and other sources from entering the binocular telescope's light path, which helps optimize the quality of your views. Additionally, internal baffles and glare threads also help optimize contrast. 

A removable carry handle, objective lens caps and a foam-lined hard carrying case is included.

Get the Orion BT100 Premium Binocular Telescope and discover how great it can be to get two eyes' worth of premium stargazing performance!

Media Buzz

Astronomy Now Magazine, August 2013
"A key feature of the BT100 binocular is that it has individual focus mounts, allowing the insertion of standard 1.25-inch eyepieces... you have the freedom to choose any magnification you want!"
"I have no doubt in my opinion that these binoculars would perform outstandingly in light pollution-free skies, producing bright stunning images of celestial objects."



Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.


Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Brighter deep sky
  • Magnification
  • Optical diameter
  • Field of view - angular
  • Field of view - linear
    131.0 ft./1000 yd
  • Apparent field of view
  • Eye relief
  • Exit pupil
  • Near focus
    50 ft.
  • Coatings
    Fully multi-coated
  • Prism
    BAK-4 Porro
  • Interpupillary distance range
    57mm - 74mm
  • Focus style
    Individual eyepiece focus
  • Waterproof
  • Tripod adaptable
  • Diopter adjustment
  • Weight
    14.7 lbs.
  • Additional included accessories
    Custom foam-lined hard carry case, 2 lock latches with keys
  • Other features
    All metal construction, single-piece design, Glare threaded, baffled, Retractable lens shades
  • Warranty
    One year

Orion BT100 Premium Binocular Telescope
Two 1.25" 22x Plossl binocular telescope eyepieces
Removable carry handle  
Binocular Telescope Lens caps
Hard carry case
White gloves

Orders received by 1pm Eastern Standard Time for in-stock item the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $25.00
3 Day Delivery: $59.00
2 Day Delivery: $59.00
Next Day Delivery: $72.00

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